1996 Buick Regal Owner's Manual - Page 233

Checking Engine Oil Pull out the dipstick and clean it with a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level. When to Add Oil If the oil is at or below the ADD mark, then you'll need to add some oil. But you must use the right kind. This part explainswhat kind of oil to use. For crankcase capacity, see "Capacities and Specifications" in the Index. 3.8L L36 (Code K) Engine Turn off the engine and give the oil 20 minutes to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. NOTICE: Don't add too much If your engine has oil. so much oil that the oil levelgets above the shows the proper cross-hatched area that operating range, your engine could be damaged. 6-11